Attachment for adding-machines.



PATENTED JUNE 26, 1906.

C. O. EARNIST. ATTACHMENT FOB. ADDING MACHINES.

APPLICATION FILED AUG.1, 1905.

Witnesses 3 $HBETS-SHEET 2.

q A} 5 m.

' Z InTTI M: 7 mlm PATENTED JUNE 26, 1906.

.H M H TF: 2 2 E= Q w 4 U. C. EARNISI'.

APPLICATION FILED AUG. 1. 1905.

in an E m ATTACHMENT FOR ADDING MACHINES.

EE Z W m $4M m F war atj r PATENTED JUNE 26, 1906.

0,0. EARNIST. ATTACHMENT FOR ADDING MACHINES.

APPLICATION FILED AUG. 1, 1905.

3 SHEETSSHEET 3 witnesses UNITED STATES CYRUS o; EARNIST, or RICEVILLE, IOWA.

ATTACHMENT FOR Te all whom-zit may concern."

Be it known that I, CYRUs C. EARNIST, a citizen of the United'States, residing at Riceville, in the county of Mitchell and State 01 Iowa, have invented certain new and useful Improvements in Attachments for Adding- Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable" others skilled in the art to which it appertains to make and use the same.

My invention relates to apparatus of ,that class used for mechanically assisting arithmetical calculations, and it is more particularly an attachement for mechanisms generally known as adding-machines.

An object of the invention, which is particularly adapted for use upon the Burroughs adding-machine, is based upon the well-l 10W11 fact that such a machine after accumulating 10,000,000.00, or whatever may be its capacity, drops the amount and accumulates anew,- beginning with .01.

Another object of the invention is to provide means whereby by the process of addition any problem in subtraction can be solved mechanically through the use of the ordinary adding mechanism.

A still further object is to provide an attachment of this characterwhich can be readily attached to adding-machines without in anywise changing the mechanism thereof and which does not interfere with the use of the machines for adding purposes.

\Vith these and other objects in view the invention consists of series of keys adapted to respectively actuate the keys of the machine to which the attachment is applied and which are provided with selective means whereby the mechanism of the complement of'any depressed key may be operated so that by a fixed rule of addition the mechanism of the adding-machine will be caused to mechanically register the result in any problem of sub-. traction.

The invention also consists of certain other features of construction and combination of parts, which will he hereinafter more fully described, and pointed out in the claims.

In the accompanying drawings I have shown the preferred form of my invention.

In said drawings, Figure l is a perspective view of an adding machine of the Burroughs type having my im roved attachment thereon. Fig. 2 is a p an view of the Specification of Letters Patent.

Application filed August 1, 1905- flerial No. 272,228.

PATENT OFFICE.

ADDlNG-MACHlNESQ t rammed June'26, i906.

mechanism of the attachment," the casing being removed and the plungers of 'the'keys of the attachment, as well as a portion ofone of the selective bars, bein'gsh'own in section. Fig. 3 is a vertical section through the attachment on line, 3 3, Fig; 2,- and showing one" of the keys of the attachment in position upon a key or the machine; Fig. '4 .is a section on line 4 4, Fig. 2. Fig.1 5 is aside elevation of one of the selective bars, ,Fig. 6 isan elevation of one of the keys of the attachment and its plunger, said plunger being partly broken away; and Fig. 7 is arr-enlarged perspective view of the mechanism for stopping the actuation of the paper-carrier and printing mechanism during certain operations ottlie attachment.

By the term complement, which I use throughout the description and claimsof this application, I desire to designate the number which when added to another number in the same column makes a total equal to the largest number appearing in said column. In other words, the complement of a depressed key is another key in the same-column the number of which when added to the number of the depressed key equals nine. 1 p,

Referring to the figures by numeralsof reference, S is a casing of any suitableform and preferably of such a size" as to fit upon thetop of an adding-machineand to completelvin close'the keys projecting therefrom In the drawings I have shown my invention applied to a Burroughs addinganachine, the mechanism of which is welL known to persons familiar with the artfan'dv which therefore need not be described by me. Thiscasing has a bottom 9 located at a sufficient distance from the lower edges .of the side Wallsof'the casing to permit the keys lOfof the addingmachine 11 to normally rcstclose to it; v, Parallel series of plungers 12 are mountedwithin apertures 13, formedwithin the top andbottom of the casing 8, and are so disposed within said casing that when the :same is in position upon the adding machine one plunger will rest upon and be supported by each key 10 of the machine. I These plunge rs are prevented from becoming displaced-by secur ng the casing 8 rigidly to the, top of the mach ne 11. Any desired meansmay-be employed,

for fastening the attachmentto the machine; but I preferably utilize angular brackets l l, which overlap the top of. the machine 11 and are clamped thereon by set-screws Extending upward from the bottom 9 of casing 8 are guide-posts 16, which extend through the corners of a rectangular frame or carriage 17 located within the casing8.

This carriage has supporting-pins 18 extending inwardly from its sides and slidably' mounted within slots 19, formed within sup porting-links 20. These links are arranged in pairs, one pair being located adjacent each side of the frame, and the members of each pair are pivoted together and normally dis posed at an angle to each other. The lower ends of the links 20 are 'slidably connected to guides 21, secured to the bottom 9, adjacent the front and rear of the casing, and the pivots 22 of the links 20 are slidably mounted in slots 23, formed in arms 24, which extend upward from the centers of the sides of frame 17. One of the links 20 has an arm 25 extending forward from it, and on this arm are located two extensions 26 and 27, which project throughapertures in the top of casing 9 and have keys 28 and 29, respectively. A hanger 30 extends downward from the arm 25 and is normally supported'by a spring 31, which is interposed between said hanger and the bottom 9. The guides 21, hereinbefore referred to, have cross-rods 32 slid'ably mounted within them, and these rods rigidly connect the links 20 at opposite sides of the frame 17. It will be understood that spring 31'exerts a constant upward pressure upon hanger 30 and arm.25 and tends, therefore, to hold the keys 28 and 29 normally in their uppermost positions. Said spring also holds the pivots 22 and the two sets of links 20 normally in the upper ends of the slots 23,

'and as thelinks 20 are engaged by pins 18, extending from the sides of frame 17, it is obvious that the one spring 31 also serves to hold the frame 17 normally in a raised position.

The two keys 28 and 29 are located in a column, preferably at the left of the series of plungers 12, and also located in a column therewith is a key 33, which is connected to one end of an angular lever 34, mounted within the casing 8 and pivoted atits rear end'to the top of said casing, asshown at 35. The heel 36, formed by this lever, is adapted to bearagainst a cross-lever 37, which is pivoted' at one end-to one side of easing 8,'as

shown at 38, while its other end is slotted,

as at 39, and is engaged by a pin 40, depending from a-bar 41, constituting one member of a resetting device. This bar 41 is slid ably mounted within the front and back portions of frame 17 and is preferably located adjacent the center of said frame.

of and parallel with the front of frame 17 and is for the purpose hereinafter, described,

7 WVhen the bar 41 is in its rearward or set position, the same is held against'mo-vement' v A head I 42 in the form of a cross-bar extends in front 44 in bar 41 and extends throughout the width of frame 17. Locking-bar 43 has par allel' arms 45 at its ends, which are pivoted -to brackets46, extending from frame 17, and

a lever 47, fulcrumed upon the bottom 9 of casing 8, preferably adjacent the right side of the frame 17, extends under the lockingbar 43-. This lever 47 has a key 48, which is disposed above the casing 8 and is adapted when depressed to cause the lever .47 to lift thelocking-bar 43 out of the notch 44. The bar 41 has its rear end reduced in thickness to form a beveled shoulder 49, whereby after the locking-bar 43 has been raised out of the notch 44 and the bar 41 hasmoved forward a predetermined distance, as will be hereinafter more fully described, said locking-bar will ride down.the inclined shoulder 49 and reassume'a position in the same horizontal plane as that assumed by it'when in the notch44.

Extending between the hanger 30 andthe lever 34 is a lever 50, which is fulcrumed at a point Within the casing, as shown at 51,

and extends through a slot 52, formed in the rear wall of easing 8. This lever is contacted normally by a pin 53, extending laterally from hanger.30, and by a pin 54,'which ,ex-

tends laterally from lever 34. The rear end of lever 50 extends downward and overlaps the ratchet 55, which-is ordinarily employed in connection with theplaten 56 of the papercarrier of the adding-machine. A shield 57 extends laterally from the end of lever 50 and is parallel with the platen and located at a point just below where the type of the printing mechanism contacts with the paper on the platen. An arm'58 projects from the lever 50 and under a pin'59, which-extends froin a dog 60, which actuates ratchet;

It is therefore apparent that when the rear endof lever 50 is raised by depressingan 1 of the keys 28, 29, and 33 the; arm 58 wi 1' contact with the pin 59 and raise'the dog 60 out of engagement with the ratchet 55, and at the sametime'the shield 57: will be lifted into position between the platenlor the paper thereon and the type, so that nojnn- 1 pression will be made ,by-the-type on the paper; but said impression will instead be received by the shield.' These parts are adapted to be locked inraised position by means-of a spring-pressed plunger 61', mountr' ed in guides 62, extending from the rear wall of casing 8. A. spring 63-bearsat opposite ends upon one .of the guides 62 and on a collar ,64,.secured to the plunger, and this spring serves to normally press one end of the plunger 61' against the lever 50. When,

however, the rear portion of the lever is raised, the spring will throw the plunger undersaid lever, so as to support it in raisedposition untilthe plunger shall have been retracted. In orderto retract the plunger at the proper time,"I provide the same with an arm 65, which overlaps one side of easing '8 and movably engages a bell-crank lever 66,

which is pivoted on a bracket -67, extending laterally from casing 8. One arm of this lever extends into the path of the operatinglever 68 ordinarily employed by adding-machines, and when said lever is thrown back it will bear against the bell-crank lever 66 and pull the plunger 61 toward it, so that the rear end of lever 50 may fall by gravity into position in the path of the plunger 61, as shown in Fig. 7. A fourth key 69 is located in the column with keys 28, 29, and This key 69, however, is merely located on one end of a plunger 12, which is adapted to rest by gravity on the total-key of the addingmachine.

As hereinbefore stated, series of plungers, all of which are similar to the plunger 12, are mounted within the top and bottom of easing S, and one plunger rests by gravity on each key of the adding-machine. These keys are ordinarily disposed in parallel rows, the keys of each row being designated by numerals 1 to 9, successively. The first row at the right of the machine, when said machine is used in computing amounts in dollars and cents, indicates hundredths, the second tenths, the third units, the fourth tens, the fifth hundreds, &c. The second plunger of the hundredths-column, which I have designated by the numeral 12 in Fig. 2, has a pin 70 extending laterally therefrom and which is normally overlapped by an arm 71, formed at one end of a rotatable rod 72, mounted 011 the bottom 9 of the casing 8. Another arm 73 is located at the other end of this rod and is overlapped by a pin 74, proj ecting laterally from the lever 34. This pin 7 4, however, does not normally contact with arm 73, but only comes in contact therewith just prior to the completion of the downward movement of lever 34. A slight downward movement is therefore imparted to arm 73 just as the lever 34 completes its downward movement; but this movement of said arm 73 is sufficient to cause thefdepression of plunger 12, which will depress the .02 key of the adding machine.

Each plunger 12 has a stop-pin 75 and an actuating-pin 76 extending from one side thereof, said pins being disposed in vertical alinement; The pins on all the (plungers project in the same direction, an located between every two series of plungers is a selective bar 77, which is arranged close to the ends of pins75 and 76 and is slidably mounted at its endsv within the front andrear portions ofuframe 17. Each of these selective bars and'bar 41 are channeled and rectangular in cross-section, and located within each of the bars and bar 41 is.a coiled spring 78, secured at one end to the bar and at its other end to the front 'of the frame 17. This has been clearly shown in Fig. 2. It is therefore obvious that the springs 78 exert a' continuous forward pull upon their respective bars. The

front ends of these bars normally contact with'ighe head 42 of the reset device. Each SGlQlCtiYQ bar has two parallel sets of lateral ly- -projecting pins which overlap the pins on the plungers 12. The pins 79 constitute the upper set on each selective bar, and the pins 80 constitute the lower set, and are so dis posed in relation to each other that when the first key in any series is depressed and its se lective bar released, the first pin 79 will come into contact with and be stopped bythe pin 75 of the depressed key, and at the same time one of the pins 80 will arrive in position directly above the pin 76 of the eighth key in the same series, said ke'y being the complement of the first key, because the sum of the two keys equals nine, or the highest number indicated by any key in the series. Should the second or 2 key be depressed, the'pin 79 nearest thereto will be stopped by the pin 75 of the depressed key, and at the same time one of the pins 80 on the shifted selective bar will arrive in position,above the pin 76 of the complement of the depressed key which is the seventh key from the front in the same series. This graduation of the pins 79 and 80 is continued, so that no matter what key of the series is depressed when its selective bar is released oneof the pins 80 on said bar will assume a position above the complement of the depressed key. In order that the selective bar may be locked in position with one of its pins 80 above the pin 76 of =-the complement of the depressed key,'I provide said selective bar with a series of lockingpins 81, equal in number to the number of plungers 12 within each column and which are adapted to cooperate with the lockingbar 43 in the manner hereinafter described. If it is desired to add any particular amounts upon the machine on which this attachment is located, the keys are depressed as ordinarily and the lever is then actuated to produce the operation of the mechanism and to cause the sums to be properly recorded and totaled. If, however, it should be desirable to subtract a sum from a given amount, the following operation iscarried out: If, for example, 352 are to be subtracted from $100, the $100 key is depressed as ordinarily, and the lever 68 is then drawn forward and released, so that the 100 willbe printed upon the paper on platen 56, and said paper will then be shifted upward so asto be'ready to receive the next sum thereunder. The operator then depresses the 352?? key, which causes its pin 75 to assume a position in front of one of the pins 79 of its selective bar 77. The key 48 is then depressed and raises the locking-bar 43 from its position in front of the locking-pins 81 on all of the bars 77.. Said bar is also raised from the notch 41 in the bar 41. Simultaneously with the raising IEO 75,-and when it assumes this position one of.

its pins 80 will arrive in position directly over a in 76 of the complement-inf the $2 key, w ich is the $7 key. All of the other selective bars 77 will stop with one pin ,80 in position over the pins 76 of their respective $9 keys. As soon as bar 41 of the reset evice reaches its forward position the bar 43, which has been traveling thereon, moves down the beveled shoulder 49, or, in other words, shoulder 49 passes from under bar 43, which assumes its engagement with the pins 81 of all the selective bars and locks said bars in the positions assumed by them. The selective bars now having been set and locked in proper position',.as just stated, lever 68 is drawn forward to print the 62 indicated by the key which still remainsset and to release said key.

. So far the adding mechanism has been op erated only in the ordinary way; but the selective bars have been set and locked in position for the following operation: The

key 28 is depressed, and as it is connected to tion.

the extension of one of the links it will cause the rods 32, to which all of the links are rigidly secured, to travel apart, and the entire carriage l7 will-therefore be forced downward on its guides 16 and all of the selective bars will move downward therewith. It is therefore obvious that those keys whose pins are-overlapped by the pins of the selective bars will be depressed by this opera Lever 68 is then swung forward and 'permitted to return. It is obvious that under ordinary conditions this operation of the lever would cause the result (999999799) to be printed and the slip of paper in the machine to be shifted automatically. This result will not occur, however, because when key 28 is depressed the pin 53, connected to it, will depress the forward end of lever 50 and will raise the do 60 out of enga 'enlent with ratchet and a so lift the shiel 57 into position to receive the impression of the type. The plunger 61 will also spring into position under the lever and hold it with the parts 60 and 57 raised. Therefore instead of the result above mentioned being recorded on the paper slip it will be received .by the shield 57 and the platen will not be rotated. When the plunger 61 springs intoengage- 'i-nent with lever 50, the bellcrank lever 66 will swing forward but when lever 68 returns after having been drawn forward it will press the bell-crank lever 66 back to its normal position and cause the plunger 61 to release lever 50, and therefore the shield 57 and the dog 60 will drop to their normal positions. The next key- 29 'is then depressed and lever 68 operated, and the operation above described will he, therefore, exactly repeated, because key 69 is connect'ed to the same parts as is key 28. The ipp'er'ator then depresses the key 33. ki'operation causes the actuation of lever 50 This in the manner above described, because a pin 54, connected to the key 33, bears on lever 50. It also causes the heel 36 of the said lever 34 to press againstlever 37 and pull back bar 41 of the reset device. Said bar will draw the head therewith, and said head will come Contact with the forward ends of all of the selective bars and will slide them back to their initial positions. During this return movement of bar 41 and before its head touches the selective bars its beveled shoulder will came in contact with the locking-bar 43 and raise it above all of-the pins 8], and therefore there is nothing to prevent the return of said bars to their initial positions. As soon as said positions have been assumed the locking-bar .43. will drop into the notch 44 and all of the parts will therefore be held in position for the repetition of the foregoing operations. Immediately prior to the completion of the downward move:

me at of key 33 its pin 74 comes in contact with arm 73 of the rotatable rod 72, and as this rod is provided with an arm 71, which bears on pin of the .02 key, said .02 key will be depressed just as the selective bars return to their initial positions. As soon as the key33 has been ,dcpressedto produce all of these results the lever 68 should be drawn forward and released, so that the .02 will be duly recorded within the machine. Key 69 is then depressed so to actuate the totalke of the machine, and upon pulling the lever 68 forward and releasing it the result of the problem in subtraction will be indicated mcclumically upon the strip.

In connection with the foregoing description of my improved attachment I will state that the Burroughs adding-machine 'constantly adds the amounts indicated by depressed keys until the total reaches the caess whereby the foregoing rinciple is utilized to subtract by means'o addition: "When the amount listed in the machine is 100.00, 100.00 is accumulated by the mechanism of the addingmachine. When the 2.00 which is to be subtracted from 100.00 is listed in the machine, said machine accumucate any amount above 10,000,000.00, and

when point is reached it will list anew, beginning with .01, and the amount listed as the esult-,.of this last-described operation 3 99.99. Should the operation be at this point, it will be seen that the 9999) would not be the correct remain- 'theiproblem in subtraction. How- "proper result is produced by repeating-k te isting of the complement 9,999,997- ,99,'which causes the machine to accumulate that amount lus, the amount 99.99 already listed, ma 'ng a total of 10,000,097 .98, and as this amount runs beyond the capacity of the machine said machine will umulate anew, beginning with .01, until 98 is listed thereby. The last operat on necessary to complete the roblem 1I1 subtraction is to list in the mac 'ne the amount .02, and said machine then accumulates the amount 98.00, which is the remainerdesired. v I The operations above described can be betr seen by the following tabulation:

Amount written.

In the o eration of the above problem indicating t e amounts accumulated I' have indicated the ciphers in the amounts. ranging above'10,000,000.00; but it will be understood that these ci hers will be eliminated only the numbers 99.99 and 97.98, respectively", will be listed. Under ordinary conditions the foregoing operation of the adding-machine would list following result:

While the problem herein explained and carried out is a very simple one, merely showing the manner of subtracting 2.00 from 100.00, it will be understood that a problem involving any amounts can be solved in this manner. It will of course be understood that no unusual space will occur upon the stripof paper between the $2 and the result, ($98,) because the platen is not roautomatically by t eadding-machine, and

9 upon the paper the tated when the keys 28,29, and 33 are depressed, norisa yi pressi'on made upon the strip. herefi; I e e the problem carried out in th macf ine is the same as that above indicated the result, as appearing upon the strip, will be asiollows: i

It will be seen that any problem in subtraction can be solved in this manner, it merely being necessaryat any time to de ress the keys in the order mentioned .and pu l operating-lever 68 after each key .48, 28;," 29, 33, and 69 has been depressed. The proper-complement of the sum to be subtracted will always be actuated in the'manner described, so that v the proper result will be invariably obtained,

. It' wi ll be noticed thatthe entire attach.- ment can be readily placed upon a machine; but it is obvious that I do not restrict myself tosuch disposition of my improved subtract!- ing mechanism, for, if desired, the same can be incorporated within the body of the machine by providing pins and 76 on the plungers of the keys 10 instead of upon auxiliary keys such as shown by me.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a series of keys; of mechanism for automatically selecting in said series the complement of any of said keys when actuated.

2. The combination with a series of keys; of actuating means, and mechanism for auto matically selecting in said series the comple ment of any of said keys and placing it in operative relation with the actuating means.

3. The combination with a series of depressible. keys; of an actuating device, and mechanism for automatically placing the complement of a depressed key in operative relation with the actuating device.

4. The combination with a series of depressible keys; of an actuating device, and mechanism for automatically placing the complement of any key, when depressed, into operative relation with the actuating device.

5. The combination with a series of depressible keys; of an actuating device, mechanism for automatically placing the complement of a depressed key into operative relation with the actuating device, and mechanism for returning said first-mentioned mechanism to its initial osition.

'6. The combination with series of keys; of mechanism for automatically selecting in each series the complement of any depressed key in the same series.

7. The combination with a series of keys; of mechanism for'automaticall selecting in said series the complement 0 any of said keys when depressed, and mechanism for returning lecting in each seriesthe complement of any key in the same series, and mechanisnrior returning the selective mechanisms to their initial positions. V

9. The combination with series of keys; of mechanism for automatically selecting. in each series the complement of any of said keys, and a lock for holding said selective mechanism upon the completionof its selection. 1

10. The combination with a seriesof keys; of mechanism for automatically selecting in said series the complement of- ,any of said keys, a lock for holding said mechanism upon the completion of its selection} and mechanism for releasing the selective mechanism and returning it to its initial position.

11. The combination with a series of keys;

' of a selective device for said series, means upon the keys for limiting the movement of" theselective device, and means upon the selective device for automatically registering j with the complement of the key limiting the movement of the device.

12. The combination with a series of keys; of a slide for said series, means upon each key for independently limiting the movement ofthe slide, and means upon the slide for auto- ''matically selecting the complement of the key limiting the movement 0 said device.

13. The combination with a series of keys; of a spring-controlled selectiveidevice, means operated by the depression of any key for limiting the movement of the selective device,

and means upon said selective device for automatically registering with the complement of the depressedkey.

. 14. The combination with a series of keys;

of a spring-controlledslide, means adapted,,

when a key is depressed, to limit the movement of the slide 1 one direction, and means upon said slide 'for automatically selecting the complement of the depressed key.

15. The combination with a series of keys; of a spring-controlled slide, means for limiting the movement of said slide when any one of the keys is de ressed, means upon the slide for automatical y selecting the complement of thedepressed key, and an actuating device for depressing the slide and the selectedcom- I plement.

16. Thecombination with series of keys;

. of a spring-controlled selective device for each series, meansoperated by the depression'of any key for limiting the movement of its selectiveJdevice in one direction, means upon each selective device for automatically selectin the complement in-the same series with a epressed key, and means for simulQ' the selective mechanism to its initial position. '8. The combination with series of keys; of separate mechanism. for automatically se-' taneously returning the selective devices to their initial positions. 1

17. The comb' ation with series of keys; of a spring-controlled selective device for each series, means operated by thedepression of any key for limiting the movement of its selective device in one direction, means upon each selective device for automatically selectingthe complement in the same series with .a depressed key, means for simultaneously returning the selective devices to their initial positions, {and means for automatically locking the selective devices when returned.

18. The combination with series of keys; of a selective device for each series, means operated by the depression of any key for limiting the movement of its selective device, means upon each selective device for automatically registering with the complement of .the depressed key, an actuating device for simultaneously depressing the selective devices and the complement en aged thereby, and means for resetting the selective devlces 1n thelr 1n1t1al posltlons.

19. The combination with a series of keys;

of a selective device, means 0 erated by the depression of a key for limiting the movement of the selective device, means upon;

said selective device for automatically registering with the complement of the depressed key, means for depressing the selectlve device andthe complement registering there with, and a locking device for holding the selective device prior and subsequent to its adjustment.

20. The combination with a series of keys 3 of a selective device, means operated by the depression of a key for limiting the movement of the selective device, means upon said selective device for automatically registeringwith the complement of the depressed key, means for'depressing the selective de-.

vice and the complement registering therewith, a locking device for holding the selective device prior and subsequent to its adjustment, and mechanism for automatically resetting the selective device subsequent to its' adjustment. I V

21. The combination with a seriesofkeys; of a selective device,means operatedby the depression of a key for limiting the movemechanism for unlocking the selectivedevice,

during the resetting operation.

means for depressing the selective dev ment of the selective device, means upon. said selective device for automatically reg1s-' -22. The combination with a series dfkeys ef a selective device, means its adjustment, means actuated by said during the resetting operation, and man- 'lective device .to its initial position, a key perated bythe depression of a key for limiting the movement of the selective device, means upon said selective device for automatically regis'-' termg with the complement of the epressed key, means for depressing the selectlve de vice and the complement registering therew th, a locking device for holding the select-- 1 ve device prior and Subsequent to its adustment, mechanism for aut0matically"re setting the selective device subsequent to its adjustment, and manually-operated means-for unlocking the selective device.

23. The combination with a series of keys; of a selective device, means operated bythe depression of a key for limiting the movement of the selective device, means upon said selective device for automatically registermg with the complement of the depressed key, means for depressing the selective device and thecomplement registering therewith, a lopking device for holding the selective device prior and subsequent to its adjustment, mechanism for automatically resetting the selective device subsequent to mechanism for unlocking the selective. device ually-operated means for unlocking the selective device prior to the selective operation. i

24. The combination with a series of keys; of actuating means, m-eans'for automatically selecting in said series the complement of any of said keys and coupling it with the actuating means, and mechanism operated by the actuating means adapted to prevent the actuation of the platen and the recording of the operation of an adding-machine.

25. The combination with a series of keys; of a selective device, means operated by the depression of a key for limiting the movement of the selective device, means upon the selective device for automatically registering with the complement of a depressed key, means for actuating the selective device to depress the complement alining therewith, means for manually returning the seactuated by said means, and mechanism 0 erated by said means adapted to prevent tl ie actuation of the platen and the recording of the operations of an adding-machine.

26. The combination with a depressible carriage and a key for actuating the same; of a series of keys adjacent the carriage, a selective device mounted within the carriage, means actuated by the depression of any key for limiting the movement of the selective device, and means upon' the selective'device for automatically registering with, and adapted to bear upon, the complement of the depressed key.

27. The combination with a resilient supported depressible carriage and a key for act ating the same; of'a series of keys ad acenllthe carriage, means movably mounted Withinthe carriage for automatically selecting/in said series the complement of any of sald keys.

28. The combination with a resilicntly supported carriage and means for manually depressing the same; of a series of keys ad acent'the'carriage, means movably mounted Within the carriage for automatically selectv means for manually depressing" the-carriage;

of series of keys adjacent ,the carriage, slides mounted within the carriage and ad'acent the series of keys, means operated by t e depression of any key for limiting the move ment of the slide of its series, means upon the slide for automatically registering with the complement of the'depressed key, said means being adapted to bear upon and actuate the complement when the carriage is depressed.

30. The combination with a resilientlysupported carriage, guides therefor, and means for manually depressing the carriage; of series of keys adjacent the carriage, slides mounted within the carriage and adjacent the series of keys, means operated by the depression of any key for limiting the-move-, ment of the slide of its series, means upon the slide for automatically registering with the complement of the depressed key, said means being adapted to bear upon and actuate the complement-when the carriage is depressed, a resetting device mounted within the carriage for returning the slides to their initial position, and means upon the carriage for manually actuating the resetting device.

31. The combination with a resilientlysupported carriage and means for manually actuating the same; of series of keys adjacent the carriage, spring-controlled slides mount-- ed within the carriage and adjacent the series of keys, means operated by the depression of any key for limiting the movement of the slide of said series, means upon each slide .for automatically alining with the complement of the depressedv key, said means adapted to depress said complement when the carriage is actuated, means upon the carriage for automatically locking the slides in adjusted position, and a manually-operatedunlocking device upon the-carriage.

32. The combination with a resilientlysupported carriage and means for manually actuating-the same; of series of keys'adjm cent the carriage, spring-controlled slides mounted within the carriage and adjacent the series of keys, means operated by the dean up pression of any key for limiting the movement ofthe slide of said series, means upon each slide for automatically alining with the complement of the depressed key, said means adapted to depress said complement when the carriageis actuated, means upon the carriage for automatically locking the slides in adjusted position, a manually-operated unlocking device upon the ca riage, and means upon the carriage for automatically unlocking and resetting the slides. The combination with an adding-machine havinga rotatable platen and a dog for actuating the platen; of a series of keys upon said machine, a selective device for said series, means operated. by the depression of a key for limiting the movement of the selective device. means upon the selective device for automatically registering with the complement of the depressed key, meansfor manually depressing the selective device and the complement alining therewith, a shield overlapping the platen, a d og-li'tting device, mechanism actuated bysaid means for automatically o'peratingthe shield and dog-lifting de- Vice, and a lock for holding said shield and device in the position to which they are adjusted.

34. The combination with an adding-machine having a rotatable platen and'a dog for actuating the platen, and an actuatinq-lever;

or a series of keys upon said machine, a selec ive device for said series, means operated by the depression of a key for limiting the movement of the selective device, means upon the selective device for automatically registering with the complement of the depressed key, means for manually depressing the selective device and the complement alining therewith, a shield overlapping the platen, a doglifting device, mechanism actuated by said meansl'or automatically operating the shield and d og-lifting-device, a lo'ck for holding said shield and device in the position to which they are' adjusted, and means operatedby the actuating-lever for unlocking said shield and dog.

35. An attachment for adding-machine comprising a casing: keystherein adapted to be "supported by and to actuate the corresponding keys of an adding-machine, means within the casing for automatically selecting the complement of any key depressed, and manuallv-operated means within said casing for actuating the selected com plement In testimony whereof I have signed my name to this specification in the presence of two subscribingwitnesses. I

- CYRUS EARNIST.

Wl'itnesses: W; ll. Rooms, R. A. CARPENTER-.- 

